Has Anyone Used These?

From what I have learned from reading articles about Bellevile washers, they are the same as conical washers. The stock washers, I presume, were the Belleville (conical) shape. My bolt pattern is 5 x 4 and I have not been able to locate a Cragar washer that will fit. Lug nut is 7/16 x 20. Have ordered washers from several sites but the center hole is way too big. Cragar says they are out of stock, so that is why I have turned to places like Classic Industries, Jegs, Year One, Rock Auto, Ebay, and local nut and bolt venders. Have been told that he washers that I need are Belleville type and place here in Houston has some in stainless steel.
Just thought I would check here to see what others thought.